People walk past the Apple logo at the Apple Store at Grand Central Terminal in New York. / Timothy A. Clary, AFP/Getty Images

by Brett Molina, USA TODAY

by Brett Molina, USA TODAY

It's a big day for Samsung. Let's look at the tech stocks to watch Thursday.

Galaxy S IV unveiling. Samsung will host an event tonight in New York, where it is widely expected that the company will unveil its Galaxy S IV smartphone.

Reports suggest the device will feature a 5-inch screen, quad-core processor and "eye-tracking" technology that scrolls based on where the user is viewing the screen.

On the international markets, shares of Samsung have been mixed. Meanwhile, keep an eye out for the stock prices of Google -- which hosts the Galaxy line's Android operating system -- and rival iPhone maker Apple. Speaking of which ....

Apple up slightly. Shares in the Cupertino, Calif., company are up 1% as its marketing chief goes on the offensive ahead of Samsung's Galaxy event.

In an interview with The Wall Street Journal, Apple's Phil Schiller blasts the Android operating system and downplays the Galaxy S IV's chances of competing with its iPhone 5. "Android is often given as a free replacement for a feature phone and the experience isn't as good as an iPhone," Schiller told the Journal.